Grinding wheel dresser



April 29, 1958 W. J. HUGHES v 2,832,330

GRINDING WHEEL DRESSER' Filed Aug. 9, 195e 2 sheets-sheer 1 .A INVENTOR.r- 38 w/L L MM I #0G/"5 ,4 Trax/Vey April 29, 1958 w. J. HUGHES2,832,330

GRINDING WHEEL DRESSER Filed Aug. 9, 1956 2 Sheets-Sheet 2 United StatesPatent l GRINDING WHEEL DRESSER William J. Hughes, Detroit, Mich.

Application August 9, 1956, Serial No. 602,978

Claims. (Cl. 125-11) This invention relates to a grinding wheel dressingdevice, and, more particularly, to an apparatus for forming precisecontours on grinding wheels.

Heretofore there has been a common practice when making contoured diesand tools to cut the workpiece down to the approximate shape or contourand then to finish the workpiece to the desired contour by hand tools.Such a practice is, of course, expensive and time consuming.Accordingly, it is the primary object of this invention to provide adevice for dressing a grinding wheel to a desired contour, in thereverse form, whereby, the contour may be ground directly on theworkpiece with a minimum of labor and expense.

It is another object of this invention to provide a grinding wheeldressing device which includes a follower means which is substantiallyfree of friction in its movements, whereby it is possible to follow theidentical contour of a template and cut the reverse identical contour ina grinding wheel, and when the contoured grinding wheel is used to grinda workpiece the identical contour of the template will be formed on theworkpiece.

It is a further object of this invention to provide a grinding wheeldressing device which includes, a novel bearing structure for mounting aholder post carrying a template follower and a diamond dressing tool,and a means for preventing grit and dirt from fouling the bearingstructure, whereby, it is possible with this device to grind anycombination of radii, angles aud/ or contours, and wherein the radii orpoints are only limited by the size of the follower points and diamonddressing tool points, and, any radii, contour or angle can be accuratelyfollowed up to an angle of 45.

It is still another object of this invention to provide; a device ofthis class which is simple and compact in construction, economical ofmanufacture, and efficient in operation.

Other objects, features and advantages of this invention will beapparent from the following detailed description and the appendedclaims, reference being had to the accompanying drawings forming a partof the specification, wherein like reference numerals designatecorresponding parts of the several views. v

In the drawing:

Fig. 1 is a front side elevational view of an illustrative embodiment ofthe invention;

Fig. 2 is a left side elevational view of the structure illustrated inFig. l, taken valong the line 2--2 thereof, and being partly in section;

Fig. 3 is an elevational sectional view of the structure illustrated inFig. l, taken along the line 3 3 thereof; n

Fig. 4 is a horizontal sectional view of the structure illustrated inFig. 3, taken along the line 4-4 thereof;

Fig. 5 is a partial horizontal sectional view of the structureillustrated in Fig. 3, taken along the line 5-5 thereof; and,

Fig. 6 is a sectional view, and enlarged, of the strueture illustratedin Fig. 5, taken along the line 6-6 thereof.

ICC

Referring now to the drawings, and more particularly to Fig. 3, whereinis shown an illustrative embodiment of the invention, the numeral 10designates a partial portion of a grinding wheel periphery on which itis desired to form a desired contour. The grinding wheel is designatedby the numeral 12. The numeral 14 designates a body or base member whichis adapted to be mounted on a suitable supporting structure as 16 bymeans of the machine screws 18 when in use. The base member i4 may befurther secured to a vertical supporting structure as 20 by' means ofthe machine screws 22. The instant device is especially adapted for usewith a surface grinder, and may be held in place by means of a magneticchuck, if desired.

The base member i4 comprises a bottom wall 24, an integral upwardlyextending vertical' rear wall 26, the left and right integral side walls28 and 29, respectively, and a front stepped portion 32 on the frontside of the bottom wall. The stepped bottom wall portion 32 includes afront vertical face 34 and a horizontal face 35 on which the template 36is mounted. The template 36 is held against the face 34 by any suitablemeans, as by means of the machine screws 38. The numeral 4), Fig. 1,designates the upper contoured edge of the longitudinally disposedtemplate 36. The contour 40 is the contour which is to be cut in theworkpiece, but which is first cut into the reverse form in the grindingwheel periphery 10.

The base member further includes the integral forwardly extending arms42 and 44 on the left. and right side walls, 28 and 30, respectively,which are joined by the integral longitudinal arm 46. As shown in Figs.2 and 3, a longitudinally extending gib 48 is secured to the arm 46, byany suitable means, as by the machine screws 50. The gib 48 has aninwardly sloping bearing surface 52.

The upper edge of the rear wall 26 is stepped and is provided with ahorizontal surface 54 terminating in the vertical surface 56, on whichsurfaces is positioned a longitudinal gib 58. The gib 58 is secured onthe rear wall 26 by any suitable means, as by the machine screws 60, andis provided with an inwardly sloping bearing surface 62.

Slidably mounted in the area between the bearing surfaces 52 and 62, ontop of the base member walls, is the lower dovetailed end 64 of theslide 66. The slide 66 is provided with a vertical hole 68`on the lowerrear side thereof in which is secured the pin 70, by means of theretaining screw 72. The pin 70 carries an integral nut 73 inwhich isthreadably mounted the horizontal screw 74.

As best seen in Figs. 1 and 2, the left and right base walls 28 and 30are provided with horizontal slots 76 and 78, respectively, in which issecured the end plates and 82, respectively. The end plates 80 and S2are secured in place by suitable machine screws, as 84. The rear end ofthe screw 74 is provided with a journal 86 which is suitably rotatablymounted in the bearing 88 in the end plate 82. The front end of thescrew 74 is integral with the shaft 90 which is journaled in the bearing92 in the front plate 80. The shaft 90 is provided with a fxedly mountedhand wheel 94 for turning the shaft.

The slide 66 is provided with a vertical aperture 96 in which is xedlymounted a vertical sleeve 98 having an aperture 99 therethrough. Acarrier member or holder post 100 is operatively mounted in saidaperture 99, as more fully described hereinafter. The upper end of theholder post 100 is provided with an axial hole 102 in which is secured agrinding wheel dressing tool 104, as a diamond tool. The dressing toolida may be secured in the holder post 100 by any suitable means, as bythe retaining screw 106. The lower end of the holder post 100 isprovided with an axial hole 108 in which is secured a` follower means110, as by means of the retaining screw 112. The follower means isprovided with the usual follower point 114. A knurled cap 116 is fixedon the holder post 100, as by means bf the hretaining screw 118, andtelescopically enclosesy the upper end of the sleeve 98 to prevent anygrit and dirt from entering between the post and the sleeve.

The sleeve 98 is vprovided with a longitudinal Lslot-120 on the outersurface thereof in which is received the guide pin 122 for maintainingthe radial relationship of the holder post 19d in the fsleeve 98. Theholder post i? may be held in an inoperative position by lifting up thepost and turning the cap 111-6'soas toremove the pin 122 from the Vslot120 and lresting the pin 122 on the top edge of the sleeve '93.

A pair of ball bearing members 124 and 126are operatively mounted in thesleeve 98 between the sleeve and the holder post 10i), and said bearingymembers are free to move a predetermined distance in thesleeve'when theholder post moves upwardly and downwardly. As shown in Figs. f5 and 6,each of the bearing members 124 and 126 comprises a retaining ring'as128 in which is operatively held a plurality of ball bearings 130. Thering 12S Yis provided with a plurality of sockets -as 132, and the ballsare heldin the sockets 132 by crimping the edges 134 inwardly.

The movement of the upper bearing member 124 is limited by the retainingring clips 136 and 133 which are positioned in the grooves 14) and142,-respectively, in the sleeve 98, A coil spring 144 is positioned inthe sleeve around the holder post 161i, and the upper endof the springabuts the retaining clip 13S and ythe lower end of the spring isseatedon the retaining ring clip 146 which is fixed in the groove 148 onthe holder post 100. The lower bearing ymember I126 is limited in itsmovement by means of the retaining clip 146 fand another retainingringclip 150 which isiixedly mounted in the groove 15,2 in the lower end ofthe sleeve 98. v In the use of the Iinvention, a template as 36 havingthe desired contour thereon is mounted on thev base member and thefollower means is brought into contact with the contour 40 of thetemplate 36. The supporting structure 16 is* moved upwardly so 'as tobring the diamond tool 104finto contact with `the grinding wheel 12 andas the wheel 12 rotates, the screw 74 is rotated by means of thehandwheel`94, which action moves the slide 66 longitudinally of the basemember 14. As the slide moves, thefollower means 11i) will slidably moveon the contoured'iedge 40 of the template and the holder post' 1110will--bemoved vertically inaccordance with the contour 40..'l`he'vperiphery-'10` of the. grinding wheel 12 will be dressed off `inaccordance with the reverse contour of -theco'ntour'40- A workpiece maythus be -quickly vand easily -cut with the :grinding wheel 12 toV forma'contour on the workpiece periphery which will be identical tothecontour 40 on the template 36.

While it will be apparentthat'the preferred embodiment of theinventionher'ein disclosedis `well calculated to fulfill the objectsabovef'statedjit Vwilljbe appreciated that the invention is susceptibleto modification, variation and change withoutdeparting--fromVthe;properscope orfair meaning of the subjoined claims.

What I claim as newis:

1. A device for forming a contour "onfa grinding surface comprising: -abase `memberya `slidewrnoi'alaly mounted on said basememberin-one'direction; means for moving said slide on said base member;means vfor mounting a template on saidbase member; a carrier membermovably mounted on said slide for movement in the direction *transverseto said o'ne direction; 7a follower meansmountedl on the lower end ofsaid'carrier member adapted to slide-on the contoured edge Iof thetemplate; a resilient biasing means normally biasing said carrier memberdownwardly so Vas to maintain said follower means in contact with saidtemplate; adres'sing tool mounted on the upper end of said carriermember for dressing a grinding surface to the contourfof said template,Yand in Vthe reverse form thereof; said carrier member being movablysupported in said slide by means of a pair of spaced apart freelymovable bearing members; said bearing members each comprising a carrierring having a plurality of sockets therein, in each of which isrotatably carried a ball bearing adapted to contact the carrier memberon one side thereof and the slide on the other side thereof to -givefriction free movement between said carrier member and said slide; saiddevice being provided with means for locking said carrier member in aninoperative position clear of said template; and, said resilient biasingmeans being operatively mounted between said bearing members.

2. A device for forming a contour on a grinding snrface comprising: abase member; a slide movable horizontally on said base member; means formoving said slide on said base member; means for mounting a templatehaving a contoured edge thereon, in a vertical positionen saidbaseimember with the contoured edgeifacing upwardly; a verticallydisposed sleeve tixedly mounted on said slide and extendingtherethrough; a holder post movably 'mounted in said sleeve for verticalmovement relative to said sleeve; -a `follower means mounted on thelower end of said holder post and adapted to slidably contact thecontoured edge of said template; a ldressing tool mounted on the upperend of `said holder post for dressing a grinding surface to the reversecontour of said contoured template edge; a resilient biasing meansnormally biasing said holder post downwardly so a's to maintain saidfollower means in Contact with said contoured template edge when saidslide is moved on said base membema pair of spaced apart retainingmembersv tixedly Amounted in said sleeve adjacent the upper end thereof;la-lirst bearing member operatively mounted between said .pair ofretaining members and operativelycontacting said holder post and saidsleeve to provide friction free movement therebetween; said resilientbiasing means being disposed 'in said sleeve and having its upper endabutting the lower one of said pair of retaining members and` its lowerend abutting another retaining member xedlymounted on the holder postadjacent the lower end thereof; a further retaining member tixedlymounted in said slee've adjacent the lower end thereof; and, a secondbearing member operatively mounted between said last mentionedrretainingmembers and operatively con- `taetingsaid holder post and ysaid sleeveto providefrictio'n free movement therebetween.

A`3. `The structure "as defined in claim 2, wherein: each of said-l1iearingmembers comprises a plurality of ball bearings carried in aring, and said-bearing members 'are 'adapted 't'omove vlongitudinally'of said sleeve between said pair-ofretaining members and said lattermentioned retaining members when said holder post movers in said sleeve.y

4. The `structure as defined in claim 3, wherein: 'said device isprovided with meansforretaining said holder postn ya lixed radialposition lwhen said holder post is 55,5. Tti'efst'rct'ur'e as'deined'infclaim 4, wherein: ja cap is xedly mounted on the upper'end of saidholderpos't and is adapted to telescopically enclose the upper end ofsaid sleeve.

References Cited in the ytile of this patent UNITED STATES PATENTS1,580,343 `Steiner Apr. 13, 1926 1,940,214 Holmes Dec. 19,1933,2,294,494 wilson. sept. 1, 1942 2,565,687 Hoier Aug. 28, 195.1

OTHER REFERENCES Y Publication: American Machinist, May 28, 1938,

page 428.

